Normalized data to lookup table

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Amit Ifrach
Amit Ifrach 2023-2-11
回答： Walter Roberson 2023-2-11
לק"י
Hello!
I got a normalized vector which I want to make as an index for lookup table (preferablt in heatmap colors or blue colors).
Thanks!
  1 个评论
dpb
dpb 2023-2-11
Well, you're going to have to gives us more background than that...show us an example of what you're trying to get from what it is you have...you might find <rescale> of interest, though.

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回答（1 个）

Walter Roberson
Walter Roberson 2023-2-11
There are a number of circumstances in which you can just use the normalized values as the data, and use a colormap(), and the value will automatically be converted into a color table index. See clim (caxis in older releases)
However if you need to do the mapping manually:
NumberOfEntriesInTable = size(YourColorTable,1);
mindata = min(YourData);
maxdata = max(YourData);
proportion = (YourData - mindata)./(maxdata - mindata);
table_idx = ceil(proportion * NumberOfEntriesInTable * (1-eps));
colored_data = YourColorTable(table_idx,:);
The output, colored_data,will be a numel(YourData) by 3 array, with Red, Green, and Blue columns.

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